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Mungenyi pegmatite, Ankole pegmatite field, Mbarara District, Western Region, Ugandai
Regional Level Types
Mungenyi pegmatitePegmatite
Ankole pegmatite fieldPegmatite Field
Mbarara DistrictDistrict
Western RegionRegion

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Latitude & Longitude (WGS84): 0° 58' 20'' South , 30° 11' 20'' East
Latitude & Longitude (decimal): -0.97222,30.18889
GeoHash:G#: kxv6qznbk
Locality type:Pegmatite
Köppen climate type:Af : Tropical rainforest climate
Nearest Settlements:
Ntungamo15,300 (2016)13.3km
Nyachera30,509 (2016)26.6km
Rukungiri14,000 (2016)31.1km
Kabale43,500 (2016)37.8km
Kanungu14,600 (2016)44.4km

Pegmatite mined for beryl.

From Gallagher and Atkin (1966):
The main Mungenyi pegmatite is about 70 ft wide and 200 ft long, and is composed of a core of massive perthitic feldspar (with minor quartz and muscovite) surrounded by decomposed albite with small amounts of quartz, perthitic feldspar, muscovite and beryl. The beryl occurs mainly near the margins of the core, forming greenish-coloured crystals up to 10 cm across. Aggregates of plumose muscovite up to 4 ft in length are conspicuous in the beryl-bearing unit.

Regions containing this locality

Somali Plate (Somalia Plate)Tectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

8 valid minerals. 1 (TL) - type locality of valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

Formula: Na(AlSi3O8)
Reference: American Mineralogist (1967): 52: 560.
Formula: Be3Al2(Si6O18)
Reference: Gallagher, M.J., Atkin, D. (1966) Meta-ankoleïte, hydrated potassium uranyl phosphate. Bulletin of the Geological Survey of Great Britain: 25: 49-54.
Formula: (Th,Pb,Ca)(PO4) · H2O
Reference: Gallagher, M.J. (1967): Phosphates and other minerals in pegmatites of Rhodesia and Uganda. Mineralogical Magazine. 36, 50-59
Meta-ankoleite (TL)
Formula: K2(UO2)2(PO4)2 · 6H2O
Type Locality:
Reference: American Mineralogist (1967): 52: 560.
Formula: KAl2(AlSi3O10)(OH)2
Reference: American Mineralogist (1967): 52: 560.
Formula: (H3O)3KCa(UO2)7(PO4)4O4 · 8H2O
Reference: Gallagher, M.J. (1967): Phosphates and other minerals in pegmatites of Rhodesia and Uganda. Mineralogical Magazine. 36, 50-59
Formula: SiO2
Reference: American Mineralogist (1967): 52: 560.
Formula: Zr(SiO4)
Reference: Gallagher, M.J. (1967): Phosphates and other minerals in pegmatites of Rhodesia and Uganda. Mineralogical Magazine. 36, 50-59

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Group 8 - Phosphates, Arsenates and Vanadates
Grayite8.CJ.45(Th,Pb,Ca)(PO4) · H2O
Meta-ankoleite (TL)8.EB.15K2(UO2)2(PO4)2 · 6H2O
Phosphuranylite8.EC.10(H3O)3KCa(UO2)7(PO4)4O4 · 8H2O
Group 9 - Silicates

List of minerals arranged by Dana 8th Edition classification

AB2(XO4)2·xH2O, containing (UO2)2+
Meta-ankoleite (TL)40.2a.8.1K2(UO2)2(PO4)2 · 6H2O
Grayite40.4.7.4(Th,Pb,Ca)(PO4) · H2O
Phosphuranylite42.4.8.1(H3O)3KCa(UO2)7(PO4)4O4 · 8H2O
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in >[6] coordination
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with [Si6O18] rings; possible (OH) and Al substitution
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks

List of minerals for each chemical element

H Meta-ankoleiteK2(UO2)2(PO4)2 · 6H2O
H MuscoviteKAl2(AlSi3O10)(OH)2
H Phosphuranylite(H3O)3KCa(UO2)7(PO4)4O4 · 8H2O
H Grayite(Th,Pb,Ca)(PO4) · H2O
Be BerylBe3Al2(Si6O18)
O Meta-ankoleiteK2(UO2)2(PO4)2 · 6H2O
O MuscoviteKAl2(AlSi3O10)(OH)2
O QuartzSiO2
O AlbiteNa(AlSi3O8)
O Phosphuranylite(H3O)3KCa(UO2)7(PO4)4O4 · 8H2O
O Grayite(Th,Pb,Ca)(PO4) · H2O
O ZirconZr(SiO4)
O BerylBe3Al2(Si6O18)
Na AlbiteNa(AlSi3O8)
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al AlbiteNa(AlSi3O8)
Al BerylBe3Al2(Si6O18)
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si QuartzSiO2
Si AlbiteNa(AlSi3O8)
Si ZirconZr(SiO4)
Si BerylBe3Al2(Si6O18)
P Meta-ankoleiteK2(UO2)2(PO4)2 · 6H2O
P Phosphuranylite(H3O)3KCa(UO2)7(PO4)4O4 · 8H2O
P Grayite(Th,Pb,Ca)(PO4) · H2O
K Meta-ankoleiteK2(UO2)2(PO4)2 · 6H2O
K MuscoviteKAl2(AlSi3O10)(OH)2
K Phosphuranylite(H3O)3KCa(UO2)7(PO4)4O4 · 8H2O
Ca Phosphuranylite(H3O)3KCa(UO2)7(PO4)4O4 · 8H2O
Ca Grayite(Th,Pb,Ca)(PO4) · H2O
Zr ZirconZr(SiO4)
Pb Grayite(Th,Pb,Ca)(PO4) · H2O
Th Grayite(Th,Pb,Ca)(PO4) · H2O
U Meta-ankoleiteK2(UO2)2(PO4)2 · 6H2O
U Phosphuranylite(H3O)3KCa(UO2)7(PO4)4O4 · 8H2O

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

1000 - 1600 Ma

ID: 3306462

Age: Mesoproterozoic (1000 - 1600 Ma)

Lithology: Sedimentary

Reference: Thiéblemont, D. (ed.). New edition of the 1:10,000,000 geological map of Africa. CGMW-BRGM. [190]

Ectasian - Paleoproterozoic
1200 - 2500 Ma

ID: 3184636
Paleoproterozoic-Mesoproterozoic crystalline metamorphic rocks

Age: Proterozoic (1200 - 2500 Ma)

Lithology: Crystalline metamorphic rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License


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Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Gallagher, M.J., Atkin, D. (1966) Meta-ankoleïte, hydrated potassium uranyl phosphate. Bulletin of the Geological Survey of Great Britain: 25: 49-54.
Gallagher, M.J. (1967) Phosphates and other minerals in pegmatites of Rhodesia and Uganda. Mineralogical Magazine: 36: 50-59.

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